-
Notifications
You must be signed in to change notification settings - Fork 3
/
group.js
99 lines (84 loc) · 1.79 KB
/
group.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
import test from 'ava';
import {
list,
map,
group,
repeat,
ncycle,
next,
range,
} from '../../../src/index.js';
import {identity} from '@aureooms/js-operator';
test('group', (t) => {
const x = (key, iterable, expected) => {
t.deepEqual(
list(map(([k, g]) => [k, list(g)], group(key, iterable))),
expected,
);
};
x(identity, '', []);
x(identity, 'AAAAAABBBBCCCCAABBCC', [
['A', ['A', 'A', 'A', 'A', 'A', 'A']],
['B', ['B', 'B', 'B', 'B']],
['C', ['C', 'C', 'C', 'C']],
['A', ['A', 'A']],
['B', ['B', 'B']],
['C', ['C', 'C']],
]);
x(
(item) => {
return item.charCodeAt(0) - 65;
},
'AAAAAABBBBCCCCAABBCC',
[
[0, ['A', 'A', 'A', 'A', 'A', 'A']],
[1, ['B', 'B', 'B', 'B']],
[2, ['C', 'C', 'C', 'C']],
[0, ['A', 'A']],
[1, ['B', 'B']],
[2, ['C', 'C']],
],
);
x(
(item) => {
return Math.floor((item.charCodeAt(0) - 65) / 2);
},
'AAAAAABBBBCCCCAABBCC',
[
[0, ['A', 'A', 'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B']],
[1, ['C', 'C', 'C', 'C']],
[0, ['A', 'A', 'B', 'B']],
[1, ['C', 'C']],
],
);
});
test('group keys', (t) => {
const x = (key, iterable, expected) => {
t.deepEqual(list(map(([k, _]) => k, group(key, iterable))), expected);
};
x(identity, '', []);
x(identity, 'AAAAAABBBBCCCCAABBCC', list('ABCABC'));
x(
(item) => {
return item.charCodeAt(0) - 65;
},
'AAAAAABBBBCCCCAABBCC',
list(ncycle(range(3), 2)),
);
x(
(item) => {
return Math.floor((item.charCodeAt(0) - 65) / 2);
},
'AAAAAABBBBCCCCAABBCC',
list(ncycle(range(2), 2)),
);
});
test('group for infinite sequence of something', (t) => {
const v = Math.random();
const [k, g] = next(group(identity, repeat(v)));
t.deepEqual(k, v);
// eslint-disable-next-line no-unused-vars
for (const _ of range(1000)) {
t.deepEqual(next(g), v);
}
});